If a car went the first third of the distance at 80 kmh, the second third at 24 kmh, and the last third at 48 kmh, what

[Vincen]

If a car went the first third of the distance at 80 kmh, the second third at 24 kmh, and the last third at 48 kmh, what was the average speed of the car for the entire trip?

A. 36 kmh
B. 40 kmh
C. 42 kmh
D. 44 kmh
E. 50 kmh

Answer: B

Source: EMPOWERgmat